I have a very odd issue with reboot or the owl carousel. This is a 4.6.6 install with reboot 3.
When the home slider loads initially the slider gets set to the same height as the width of the slide. When it transitions to the next slide (in this case I have 2) the height gets corrected.
My test install is here:
http://probotest.com/test-xcart4.6.6/
any ideas what the problem could be?